But the fastest riser for girls in 2012 was Arya, shooting to 413 from 711 in 2011 and 942 in 2010.

It's the name of a beloved character in the "Game of Thrones" series on HBO. The youngest daughter of the Stark family, Arya (played by Maisie Williams) is a fan favorite -- a defiant tomboy with a stubborn, independent streak -- and the polar opposite of her proper sister, Sansa. Arya is happier firing arrows on the archery range or secretly attending "dance lessons" with Syrio, a trained killer who teaches her to wield her sword, Needle.

Based on "A Song of Ice and Fire," the epic fantasy novels by George R.R. Martin, "Game of Thrones" has been a breakout hit for HBO. (HBO and CNN are units of Time Warner.) Now in its third season, the show initially delighted genre fans, but quickly built a much larger audience with its blend of action, intrigue and ample doses of sex and violence.

Actress Maisie Williams plays Arya on HBO's "Game of Thrones."

(For the record, Sansa, Syrio and Needle are nowhere in the top 1,000.)

The fastest riser for boys in 2012 -- Major, coming in at 483 -- is harder to peg. The Social Security Administration helpfully points out that it could be "in tribute to the brave members of the U.S. military," or perhaps because Major is the name of the youngest son of designers Cortney and Robert Novogratz on the HGTV show "Home by Novogratz."

Parents submit children's names when applying for Social Security numbers when they're born. Popular names sometimes reflect characters in pop culture, style icons or plain old demographic changes.The names Gael and Perla also rose fast in 2012, the Social Security Administration said, noting that both are popular among Spanish speakers.

Rounding out the top 10 for boys in 2012 were Mason, Ethan, Noah, William, Liam, Jayden, Michael, Alexander and Aiden. Jacob has dominated the top spot since 1999. Liam made its debut in the top 10 in 2012, booting Daniel.

For girls, other top names were Emma, Isabella, Olivia, Ava, Emily, Abigail, Mia, Madison and Elizabeth. It's not Elizabeth's first trip to the top, but it did replace Chloe on the list in 2012.